Multicomponent polymer for rigid polyvinyl chloride and preparation method of multicomponent polymer

Abstract

The invention aims at providing a multicomponent polymer for rigid polyvinyl chloride and a preparation method of the multicomponent polymer. The multicomponent polymer is prepared by a polymer emulsion intermediate A and a polymer emulsion intermediate B at a mass ratio of 9:1-8:2, wherein the polymer emulsion intermediate A is prepared by a monomer A (comprising a functional monomer and vinyl acetate), water, a dispersing agent, an emolsifier, an initiator and a separant; and the polymer emulsion intermediate B is prepared by a monomer B (comprising alkyl acrylate and methyl methacrylate), water, an emolsifier and an initiator. The polymer is excellent in plastification performance and self-lubricating property, can increase extrusion velocity, improves production efficiency, greatly improves melt strength greatly, and increases a balancing torque greatly on the premise of ensuring a plasticification degree. The water resistance, alkali resistance and heat resistance of a copolymer are improved. The invention further provides a preparation method of the polymer, which is simple and easy to operate.

Description

technical field [0001] The invention relates to a novel processing modifier for rigid polyvinyl chloride (hereinafter referred to as PVC) and its preparation method, in particular to a multi-component polymer for synthesizing rigid polyvinyl chloride by copolymerization-blending method and its preparation method. Background technique [0002] PVC is a well-loved, popular and widely used synthetic material in the world today. It is the second most used synthetic material worldwide. my country is the world's largest PVC production and consumption country, and related PVC products have a broad market environment, which is both powerful and broad. Based on the rapid development of urban and rural construction engineering, transportation engineering, environmental engineering, energy and water conservancy engineering, etc., the market demand for PVC building materials and engineering materials is increasing day by day, and it is currently one of the plastic varieties with the l...

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Problems solved by technology

Methyl methacrylate-butyl acrylate (or ethyl acrylate) copolymer has the advantages of excellent processing performance and heat resistance, which can endow products with a wide processing temperature range, high melt strength, and good surface Smoothness and dimensional stability; compared with acrylate processing modifiers, styrene-acrylonitrile processing modifiers have obvious cost advantages, but because styrene contains unsaturated double bonds, the anti-ultraviolet and anti-aging properties Generally, at the same time, the compatibility of styrene and PVC is relatively poor, the processing range is narrow, the melt plasticization is slow, and the surface finish of the product is not good; the blended resin mixed with nano-modified inorganic fillers is modified by the above two types of processing Based on the agent, it is combined with fillers such as nano-calcium carbonate, silicon dioxide, mica powder, etc., so as to reduce the product price

The greater the amount added, the more obvious the decline in mechanical properties of rigid PVC products, such as increased brittleness of products, slow melt plasticization during processing, decreased surface finish, and dimensional stability that cannot meet expected indicators, etc.

[0004] Although alkyl methacrylate, alkyl acrylate resins, acrylonitrile and styrene resins have certain advantages in improving the compatibility and plasticization of processing aids and PVC, but with the rising price of petrochemical raw materials Force PVC processing modifier production, application manufacturers have to add a large amount of inorganic fillers, in order to reduce costs and seek business development

Eventually, a vicious circle was formed, which seriously hindered the overall level of the rigid PVC products industry and deviated from the national overall plan of "replacing steel with plastic and wood with plastic".

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